Grinding or polishing machine



Deg. 19, 1944; P. s. NEWSWANGER GRINDING OR POLISHING MACHINE Filed Sept. 17, 1943 2 Sheets-Sheet 1 I l I I l 31min, Top

NEWS/MW? Dec. 19, 1944. P. s. NEWSWANGER 2,365,584

GRINDING OR POLISHING MACHINE Filed Sept. 17, 1943 2 Sheets-Sheet 2 Patented Dec. 19, 1944 UNITED STATES FAT'ENT OF FICE.

2,365,584 TGRINDINGOR roLl' snlNG -Pa u1 Seifried Newswanger, near-Lancaster, Pa.

Application September 17, 1943, semi Nb. 502,807

's'o anns. (01. 51 135) v This invention relates to a machine for'smoothing and polishing o'fthe radiuse's or convex faces of deep drawing dies for fabricating 'sheet metal or other sheet material which may be given a permanent "form 'by operating thereon with dies.

the smoothingand polishing of such faces of such dies it hasbeen usual practice to employ a rotary grinding or polishing head which has resulted "in the "forming of scratches or ridges extending at right anglesor substantially so to the direction of application of the dieto the work, and even though these ridges or scratches "be so "minute as to he imperceptible except with the aid.ofapowerfulmagnifying glass they nevertheless positively engage-"with the sheet metal being drawn and have a tendency to tear or shear the 'sheet'metal.

The present invention has been developed with the above considerations in mind andhas for its primary object's,"to:provide a machine for smoothing andvpolishing .such fdie faces in the direction varying lengths of bands, such adjustment means also serving as means whereby the one machine may be adjusted or adapted to operate upon a great variety of sizes, forms, and lengths or depths of dies.

In the accompanying drawings:

Figure 1 representsa top plan of a machine,

embodying my inventionasfmounted in one of the usualslots ofthe usual machine table or work-bench;

Figure la side elevation of my invention shown in Figure l and as mounted in said figure;

Figure 3,a'secti0na1 view on the line 33 of Figure 2, looking "in the direction of the arrows; Figure 4, a sectional view "on the line i -4 of Figure '2, lookingfinthe direction of the arrows; and v Figure 5, a fragmentary central longitudinal sectional view corresponding to the upper portion of Fig. '21to show in comparison therewith the deflected form of the smoothing or polishing belt when'opera'tin'g upon a diesuch as X.

Referring now :in detail to the drawings, A

designates the usual slotted machinetable, bench or bed having a slot or slots *C extending through the bottom ofthe channel orguide-wayLB; .D an electric motor suitably connected :by any usual .:means not shown, with a source ofyelectric energy, not shown and-having asa portion of its casing an end plate -E secured by screws or bolts For by :welding or any other usual or suitable means to the support or body plate M of the polishing or grinding =machin'e of my invention; G the shaft I drive pinion H meshing with and driving a gear wheel 3 mounted to turn about the axis of shaft K-"mountedin or upon the end iplate E. The 15 drive beltwheel -8 is also mounted upon shaft K and so associated with-the gear Wheel J or the shaft K or both as to turn about the axis of the shaft "with the gear wheel J, a cross -pin L passing throughthe free end of the shaft K servin'g "to confine the gear wheel J and drive -belt whee1"-8 on said shaft K between the pin-Land the opposed face of end plate E.

A supporting or suspending "member having an "angular head "Q corresponding in cross-sectional "sizefand shape to the "cross-sectional size and shape of'th'e channel "or guide-way B and formed with a bl'flilicailied body (9 depending "through the slot .0 and receiving 'betweenit's furcation's the upper rear portion of the body plate M is positively connected to the latterby any usual "known means, as'by Ib'olts U passing through said furcations and the intervening portion of the body ,platelVLand (a similar, supporting member'having a similar headR, w'ith'i'ts top surface sufiiciently below the surface, and preferably only sufiiciently vbelow, theisurface of the top of the table 'or Qhench ,A to accommodate the thickness "of the grinding or polishing belt Lhas a similar bifurcated body P similarly receiving between its furcations the upper forwardpr front portion of the body plate M, with bolts U passing through its .furcationsand the intervening portion of the bodyplate"M servingito positively connect said .turcations P orlhody to the bodyplate M.

@P-referablygone {of theiurcations Of the body Pt-will have welded. or otherwise secured or connected to .it va.:lateral1y,projecting lug S through which is threaded ;a olamping or lock screw T to be turned through said lug S andpressagainst the adjacent llower opposedxface of the table or The grinding, sm'oothlor polishing endless. band or belt I passes around the flanged support and applicator roller or bearing surface I, the drive belt wheel 8 and the tension roller I0, and behind the guide flanged roller 9 interposed between the drive wheel 8 and the tension roller or wheel I and serving to hold a large area of the band or belt I in contact with the drive wheel 8 when the said band I is pulled tight by the tension wheel or roller ID as pulled by the weight IE or otherwise held tight by any suitable tensioning means.

The upper or support and/or applicator roller or bearing or belt spreading element 1 may be in the form of a flanged wheel or roller, such as I, mounted on a shaft 2 to turn in the bifurcated upper end 3 of the adjustable spreader bar 4 which fits with its adjacent side portion between the walls of a very shallow groove 6 to be guided therein and heldthereby against turning about the clamping screw 5 when the latter is turned up or into clamp said spreader bar 4 tightly against the opposed face of the groove 6 in the body or plate M, the said spreader bar 4 being slotted lengthwise for an appreciable portionof its length to permit it to be adjusted in the direction of its length to adapt, it to different sizes of bands or belts I, either as initially put into use or to accommodate any stretching that may have taken place during prior use, in so far as the size, character and depth or length of the cavity of the die or other article being operated upon will permit and also, of course, to permit adjustment of the position of the upper end portion of the spreader bar 4 as may be required by the size and depth or length of the cavity of the work piece being operated upon, and to permit the adjustment of the upper end portion of the spreader bar 4, or the position of the roller I, a may be required by the extent of the cross-sectional profile of the convex radius surfac being operated upon.

The weight I6 is connected by a suitable cord, rope or other flexible connection I5 to a slide eye I4 of the slide I3 which makes a free sliding fit in the channel B and rotatably carries the tension take-up wheel ID, the rope, cord or other flexible connecting means I5 passing over a grooved wheel I'I mounted for'rotation about the aXis of a shaft or pin I8 spanning the outer end portion of the channel slot C and fixed in position relative to the body plate M and the slide I3.

The operation is as follows, assuming the band I is being driven by the motor D through its shaft G, pinion H, gear wheel J and drive belt wheel 8, and that th belt I is stretched by the tension means to extend across the hypothenuse of the triangle defined by the forward side of the spreader bar 4, the top of the machine tabl or bench A extending between said bar 4 and the crest of the tension roller I0 when the latter is pulled to its extrem forward position by the weight I6 and said hypothenuse, the work-piece or deep drawing die X is fitted or applied over the upper end of the bar 4 and pressed downward, or allowed to settle downward under its own weight, until its bottom face rests upon the upper face of the table A and then, with the forward portion of its inner wall closely adjacent to, or substantially in rubbing contact with, the forward face of the bifurcated upper end of the bar 4 and that portion of the band I which then extends substantially parallel to the upper portion of the bar 4 from the roller I to a point slightly above the top of the table A, or in other words from the roller l to the upper end of the radius face of the work-piece X, the said work-piece is turned or rotated about its axis, presenting as turned new portions of its radius face and inner wall face to the grinding, smoothing or zpolishing action of the abrasive or polishing band I. During such application of the work-piece X to the belt I the tension wheel I0 will move rearwardly as necessary to permit the belt I to define the two sides of the triangle as required by its operative or grinding or polishing form or condition, while functioning under the pull of the weight I6 to maintain the belt I under the same degree of tension at all times, whether in the position shown in Figure 2 or the smoothing or polishing position shown in Figure 5 or in any intermediate position or condition.

The work-piece X will be turned or rotated about its axis as many times during any given grinding or polishing operation as the operator may think necessary or desirable and a plurality of belts I will be employed, varying from a relatively coarse grinding belt at the extreme end or initial operative stage through finer grained grinding or smoothing belts to burnishing or polishing belts at the final operative stage or stages.

In changing the belts I, the belt may be slacked by either moving the tension wheel I0 rearward or by lowerin the spreader bar 4, whereupon the belt I may be removed in a lateral direction from the tension roller I0 or spreader roller I or drive wheel 8, after which it may be easily removed laterally from aboutthe other two rollers and from behind the flange of the guide roller 9, and the next belt required by the operation upon the die or work-piece X may be applied laterally by the reverse of the removal operation, after which th motor D will be energized to cause the belt to travel about the wheels I, 8 and I0 under tension of the weight I6, and the next step of the smoothing operation will be performed as above, this being repeated with each belt I through the series from the coarsest grinding belt to the smoothest polishing belt, though of course a number of work-lpieces may be treated at each step of the operation, thus cutting down the number of belt changes per work-piece operated upon.

I claim:

1. A portable machine for grinding the convex radius and adjacent plane surfaces of a deep drawing die, said machine comprising a frame to be suspended through the slot of a machine work table having a plane surface, means for suspending said frame through such a slot in definite fixed position with relation to the plane surface of said table, an adjustable spreader bar mounted on said frame to extend through the slot in said table above the plane surface thereof and having a band backing and work positioning face extending perpendicularly to the adjacent portion of said plane surface of said table, means for holding said spreader bar in any selected position of adjustment, a cylindrical spreader roller carried by the free end portion of said spreader bar above the plane surface of said table and having a surface portion coincident with the perpendicular band backing and work positioning face of said bar, in combination with a drive pulley mounted on said frame, a guide pulle mounted on said frame, an electric motor mounted on said frame, drive means driven by said motor and driving sai drive pulley, a tensioning roller slidably mounted in the slot of said table, yieldable means acting upon said tensioning roller to pull it away from the perpendicular band backing and work positioning face of said spreader bar, and a loopform polishing belt extending around said drive pulley, spreader and tensioning rollers and engaged by said guide pulley and driven by said definite fixed position with relation to the plane surface ofsaid table, a spreader bar mounted on said frame to extend through the slot in said table above the plane surface thereof and having a band backing and work positioning face extending perpendicularly'to the adjacent portion of said plane surface of .said table, and a cylindrical spreader roller carried by the free end portion of said spreader bar above the plane surface of said table and having a surface portion coincident with the perpendicular band backing and work positioning face of said bar, in combination with a drive pulley mounted on said frame, means for driving said drive pulley, a guide pulleylmounted on said frame, a tensioning roller slidably mounted in the slot of said table, yieldable means acting upon said tensioning roller to pull it away from the perpendicular band backing and work positioning face of said spreader bar, and a loop form polishing belt 'extending around said drive pulley, spreader and tensioning rollers and engaged by said guide pulley and driven by said drive pulley about said drive pulley and spreader and tensioning rollers.

3. A portable machine for polishing the convex radius surface and adjacent plane surfaces of a deep drawing die, said machine comprising a frame to be suspended through the slot of a machine work table having a plane surface, means for suspending said frame through said slot in definite fixed position with relation to the plane surface of said table, a spreader bar mounted on said frame to extend through the slot in said table above the plane surface thereof and having a band backing and work positioning face extending perpendicularly to the adjacent portion of said plane surface of said table, and a cylindrical spreader roller carriedby the free end portion of said spreader bar above the plane surface of said table and having a surface portion coincident with the plane of said perpendicular face, in combination with a guide pulley mounted on said frame, a drive pulley mounted on said frame, a motor mounted on said frame, drive means driven by said motor and driving said drive pulley, a loop form polishing belt, and yieldaible belt tensioning means engaging said belt, said belt being driven by said drive pulley about said drive pulley and spreader roller and in engagement with said guide pulley and said tensioning means,

and said tensioning means serving to hold a portion of the polishing belt in driving contact with said drive pulley and tending to hold another portion of the belt in a path slanting from said tensiomng means to a point above the table where it passes about the spreader pulley and yielding to permit the latter portion of the belt to be depressed to an extreme point wherein belt p0r-" tions travel at right angles to each other adjacent the spreader arm portion extending above said table.

PAUL SEIFRIED NEWSWANGER. 

